Just make sure before you buy that land there's no building restrictions, some areas it can be tough, you see steel barns and think they are considered similar, but sometimes they aren't.
In the article i like the sloped roof, container cost is cheap x3, but stuctural work would be very expensive, I actually looked into this one and the costs were prohibitive because of that.
So i looked around and the lead photo is now what i would lookd to go with, 4 containers 2x2 stacked and offset, balcony at the back, at a later date easily add a few more to make it a 'T' shape and have a garage/ workshop and additional bedrooms and potentially a large roof terrace. Just need to make sure the concrete slab is all poured at the same time for the future.
The other thing i considered and you could too if its in a good area, have individual containers to rent out on Airbnb to generate residual income, $2600 for a container, slowly make it a casita, if it seems to work add another etc...if it doesn't sell it as a small home, new owner can pick it up and take it away